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Abstract: This rulemaking would identify effective procedures that hazardous liquid operators can use to improve the protection of High Consequence Areas (HCA) and other vulnerable areas along their hazardous liquid onshore pipelines. PHMSA is considering whether changes are needed to the regulations covering hazardous liquid onshore pipelines, whether other areas should be included as HCAs for integrity management (IM) protections, what the repair timeframes should be for areas outside the HCAs that are assessed as part of the IM program, whether leak detection standards are necessary, valve spacing requirements are needed on new construction or existing pipelines, and PHMSA should extend regulation to certain pipelines currently exempt from regulation. The agency would also address the public safety and environmental aspects any new requirements, as well as the cost implications and regulatory burden.